Low-energy excitations in NaxCoO2 · yH2O: Experiments and simulation

P. Leininger, J. P. Rueff, M. Four, G. Vankó, H. Iishi, A. Yaresko, J. M. Mariot

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Abstract

We report on resonant inelastic X-ray scattering measurements on Na0.7CoO2 and on the corresponding hydrated compound Na0.35CoO2 · yH2O at the Co K-edge. The spectra exhibit a single excitation at 10 eV energy transfer which resonates at the energy of the Co K white line. The experimental results are analyzed within the linear muffin-tin orbital approach and compared to the calculated electronic density of states and optical conductivity spectra. The poor agreement between calculations and experiment is attributed to effective screening effects from electrons in the Fermi sea. The 10 eV feature can be tentatively attributed to a charge transfer excited state, or more likely to a damped plasmon mode.

Original languageEnglish
Pages (from-to)165-169
Number of pages5
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume246
Issue number1
DOIs
Publication statusPublished - máj. 1 2006

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Instrumentation

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